As God is my witness, I thought this was gonna be funnier. I was deceived by the previews, which made it seem like kind of a slapstick hoot. And the IMDB has it as "Biography, Comedy, Drama".
To quote a (different) Brit queen: We were not amused.
Queen Anne is initially under the spell of manipulative Lady Sarah; she's finagled her into supporting a ruinous war with France (for a reason I missed, if it was provided). This goes along with punitive taxes on the populace, which they are pretty irked about.
Along comes Abigail, Sarah's cousin, who's trying to recover after a spell of degrading prostitution. She turns out to be equally as adept at winning the Queen's fancy, especially when she appeals to her, um, baser instincts.
To quote Bugs Bunny: of course you know, this means war.
Sarah and Abigail wage a genteel, and not-so-genteel war on each other. This is set against a backdrop of unending perversion (in this movie, everybody's pretty kinky and degenerate).
Nominated for 10 Oscars, and Olivia Colman won for Best Actress, playing Queen Anne.